fix ExportsInfo

- should mark every export canMangleProvide=false if there are unknown exports
- add __webpack_exports_info__.<name>.canMangle to api
- add test case

lib/ExportsInfo.js

@@ -291,15 +291,15 @@ class ExportsInfo {
 			}
 		}
 		for (const exportInfo of this._exports.values()) {
+			if (!canMangle && exportInfo.canMangleProvide !== false) {
+				exportInfo.canMangleProvide = false;
+				changed = true;
+			}
 			if (excludeExports && excludeExports.has(exportInfo.name)) continue;
 			if (exportInfo.provided !== true && exportInfo.provided !== null) {
 				exportInfo.provided = null;
 				changed = true;
 			}
-			if (!canMangle && exportInfo.canMangleProvide !== false) {
-				exportInfo.canMangleProvide = false;
-				changed = true;
-			}
 			if (targetKey) {
 				exportInfo.setTarget(targetKey, targetModule, [exportInfo.name], -1);
 			}

lib/dependencies/ExportsInfoDependency.js

@@ -46,6 +46,12 @@ const getProperty = (moduleGraph, module, exportName, property, runtime) => {
 		}
 	}
 	switch (property) {
+		case "canMangle": {
+			const exportsInfo = moduleGraph.getExportsInfo(module);
+			const exportInfo = exportsInfo.getExportInfo(exportName);
+			if (exportInfo) return exportInfo.canMangle;
+			return exportsInfo.otherExportsInfo.canMangleProvide;
+		}
 		case "used":
 			return (
 				moduleGraph.getExportsInfo(module).getUsed(exportName, runtime) !==

test/__snapshots__/StatsTestCases.basictest.js.snap

@@ -3274,7 +3274,7 @@ cacheable modules 1.22 KiB
     ModuleConcatenation bailout: Module is not an ECMAScript module
 webpack x.x.x compiled successfully in X ms
 
-asset main.no-side.js 979 bytes [emitted] [minimized] (name: main)
+asset main.no-side.js 993 bytes [emitted] [minimized] (name: main)
 runtime modules 1010 bytes 4 modules
 orphan modules 102 bytes [orphan] 2 modules
 cacheable modules 1.35 KiB

test/configCases/parsing/harmony-reexport/a.js

@@ -0,0 +1,7 @@
+import { b } from "./b";
+
+export function a() {
+	return b();
+}
+export const aUsed = __webpack_exports_info__.a.used;
+export const aProvided = __webpack_exports_info__.a.provideInfo;

test/configCases/parsing/harmony-reexport/b.js

@@ -0,0 +1 @@
+export function b() {}

test/configCases/parsing/harmony-reexport/index.js

@@ -0,0 +1,9 @@
+import { a, aUsed, aCanBeMangled, aProvided } from "./reexport";
+
+if (a()) console.log("a");
+
+it("should not allow mangle if some exports are unknown", () => {
+	expect(aUsed).toBe(true);
+	expect(aProvided).toBe(true);
+	expect(aCanBeMangled).toBe(false);
+});

test/configCases/parsing/harmony-reexport/reexport.js

@@ -0,0 +1,3 @@
+export * from "./a";
+export * from "./empty";
+export const aCanBeMangled = __webpack_exports_info__.a.canMangle;

test/configCases/parsing/harmony-reexport/webpack.config.js

@@ -0,0 +1,2 @@
+/** @type {import("../../../../").Configuration} */
+module.exports = {};